JPH0448896Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a floating positioning type bush press-fitting device that efficiently and accurately press-fits a bush into a workpiece having a plurality of press-fit holes.

Conventional Technology Conventionally, when press-fitting a bush into a workpiece that has two or more press-fit holes, the machining of the press-fit holes and the area around the press-fit part is carried out to ensure the pitch accuracy between the press-fit holes and the accuracy of the press-fit receiving seat. Then, a single device simultaneously press-fits the bushings into each press-fit hole.

In this way, automatic insertion of a cylindrical body such as a bush into a hole has conventionally been proposed in Japanese Utility Model Application Publication No. 55-156829 and Japanese Utility Model Application Publication No. 58-58.
As shown in No. 126131 and No. 59-39132, the targets are workpieces whose holes are accurately positioned. This is an improved version of the drive side that moves and inserts the shaped body.

Problems that the invention aims to solve However, when press-fitting a bush into a workpiece for which machining accuracy is not ensured,
Because the pitch accuracy between the press-fit holes and the positional accuracy of the press-fit seats cannot be obtained, it is difficult to position at multiple press-fit parts and to receive the seats in the press-fit direction, and one press-fit device can handle two or more locations. There is a problem in that it is technically difficult to press-fit the bushing into the press-fit hole, and two or more press-fitting equipment are required.

The basic purpose of this invention is to solve the above problems, and even for workpieces for which machining accuracy is not guaranteed, a single device can accurately press-fit a bushing into two or more press-fit holes on a workpiece. The object of the present invention is to provide a floating positioning type bush press-fitting device that can perform the above-mentioned operations.

Means for Solving the Problems In other words, the floating positioning type bushing press-fitting device of this invention is a bushing press-fitting device that press-fits a rubber bush into a press-fitting hole of a workpiece. and a press-fitting unit, and the workpiece positioning unit includes a press-fitting part support member disposed on a base so as to be elastically movable within a predetermined range in the press-fitting direction of the bush, and a press-fitting part support member whose tip end is connected to the press-fitting part. It has a smaller diameter than the inner diameter of the hole, and has a base end that is tapered to have approximately the same diameter as the inner diameter of the press-fit hole, and is inserted into the press-fit hole placed on the press-fit part support member through the press-fit part support member, and is elastic. The reference guide unit is composed of a workpiece holder that restricts the movement of the workpiece within a predetermined range in the forward direction of the positioning pin, and a predetermined range of the press-fitting part support member in the press-fitting direction of the bush. The press-fitting unit holds the bushing on a press-fitting shaft that is fitted on the same axis as the positioning pin, and also presses and retreats the positioning pin to move the press-fitting bush. It is characterized in that it is constituted by a moving means for moving toward the press-fit hole.

Function According to this invention, a workpiece positioning unit, a reference guide unit, and a press-fitting unit are arranged for each press-fitting hole, and these units can be operated for each press-fitting hole.

That is, the unit corresponding to the press-fit hole to be press-fitted is operated, the movement of the workpiece and the press-fit part support member is restricted by the reference guide unit, and then the positioning pin is advanced and fitted into the press-fit hole. The positioning pin has a tapered shape with its base end having almost the same diameter as the press-fit hole, so the press-fit hole is centered, and the workpiece moves forward until the workpiece holder is applied, and the workpiece moves forward until the workpiece is pressed into one press-fit hole. Positioning is performed. In this case, the workpiece and the press-fitting part support member are movable within a predetermined range in the press-fitting direction, and are in a so-called floating state. On the other hand, the press-fitting unit holding the bushing is operated to push the bushing into the press-fitting hole. In that case, the press-fitting shaft fits into the positioning pin, so that the bush is centered with respect to the press-fitting hole, and the press-fitting shaft elastically pushes and retreats the positioning pin, so that the bush is fitted into the press-fitting hole.

At this time, the pushing force of the bushing is transmitted to the other press-fit parts, and the press-fit parts are supported by the press-fit part support members.

Embodiment Next, an embodiment of this invention will be described based on the accompanying drawings.

The workpiece 1 to be press-fitted has two press-fit holes 2,
2, and a bush 3 whose outer peripheral portion is made of rubber is press-fitted into the press-fit hole 2 by a press-fit device.

This press-fitting device will be explained below.

Plate-shaped press-fitting part support members 6, 6 that can be moved up and down through which the fixing pin 5 passes are arranged on the base 4, and a coil spring is installed between the base 4 and the press-fitting part support member 6. 6a is provided to constantly urge the press-fitting part support member 6 upward. The workpiece 1 is arranged such that a press-fitting part 2a having a press-fitting hole 2 is positioned on a press-fitting part support member 6.

A press-fitting unit is disposed above the press-fitting hole 2, and this press-fitting unit is provided with a press-fitting cylinder 7 operated by hydraulic pressure as a moving means so that its operating axis, that is, a press-fitting shaft 7a, is directed downward. The shaft 7a has a press-fitting bush 3.
is embedded.

An air cylinder 8 is disposed facing upward in the lower part of the press-fit hole 2, and a positioning pin 9 provided at the tip of the air cylinder 8 is connected to the base 4 and the press-fit part support member 8.
It slidably penetrates through the press-fit hole 2 and is located below the press-fit hole 2. As shown in FIG. 1, the diameter of the positioning pin 9 is approximately the same diameter as the inner diameter of the press-fit hole 2 at the base end, and smaller than the diameter of the press-fit hole 2 at the tip, and the diameter of the positioning pin 9 is approximately the same as the inner diameter of the press-fit hole 2 at the base end. A fitting hole is formed and inserted so as to fit on the same axis.

Further, on the base 4, on the side of the press-fit hole 2, a rail 10 facing the press-fit hole 2 is arranged,
A slide unit 11 is slidably mounted on the rail 10.
is located. An operating shaft of a cylinder 12 facing the press-fit hole 2 is connected to the slide unit 11, and the slide unit 11 is moved on the rail 10 by this cylinder 12. At the tip of the slide unit 11, there is a press-fitted part 2a of the workpiece 1.
A work holding plate 13 is inserted into the gap between adjacent frames 1a and 1a to restrict upward movement of the work 1, and is extended. A stopper 15 is inserted between the press-fitting part support member 6 and the base 4 to restrict downward movement of the press-fitting part support member 6.

Next, the operation of this device will be explained.

First, when the workpiece 1 has two press-fit holes 2, the positioning pin 9 corresponding to the press-fit hole 2 into which the bush 3 is first press-fitted is raised.
By fitting the positioning pin 9 into the press-fit hole 2, the set position of the workpiece 1 is determined. Next, actuate the cylinder 12 for one press-fit hole 2,
The slide unit 11 is moved along the rail 10 toward the press-fit hole 2. By this movement, the work holding plate 13 is inserted into the gap between the frames 1a and 1a. The workpiece 1, that is, the press-fitting part 2a, has a predetermined degree of freedom and is restricted from moving upward by the holding plate 13. Further, a stopper 15 connected to the presser plate 13 is inserted below the press-fitting part support member 6 to restrict downward movement of the press-fitting part support member 6 while leaving a predetermined degree of freedom. Next, the air cylinder 8 is operated to raise the positioning pin 9 and guide the press-fit hole 2 to the tip. Furthermore, as the positioning pin 9 rises, the base end fits into the press-fit hole 2, and while positioning the press-fit hole 2, the press-fit portion 2a of the workpiece 1 is pushed up to a position where it abuts against the holding plate 13. At this time, the air cylinder 8 is not operated on the side of the other press-fit hole 2, and the press-fit portion 2a is maintained at its original position.

Next, the press-fit cylinder 7 is operated with respect to the press-fit hole 2 positioned in a floating state by the positioning pin 9, and the bush 3 fitted on the press-fit shaft 7a is lowered.

When the bush 3 comes into contact with the press-fit hole 2, the press-fit support member 6 in the floating state is moved by the coil spring 4.
is pushed down against the This pressing down continues until the press-fitting part support member 6 comes into contact with the stopper 15.

On the other hand, the press-fit shaft 7a is fitted into the positioning pin 9, and a downward pressing force is applied to the air cylinder 8.
The air inside is compressed to lower the positioning pin 9.

As mentioned above, as the means for raising and lowering the positioning pin 9, it is desirable to use an air cylinder because it is necessary to lower the positioning pin 9 at the same time as the bush 3 is lowered. However, even if a hydraulic cylinder or the like is used, it is also possible to use an appropriate elastic means interposed between the cylinder and the positioning pin, and the bushing can be controlled by an appropriate control means without interposing an elastic means. It is also possible to configure the positioning pin 9 to be lowered as the positioning pin 3 is lowered.

Note that by press-fitting the bushing 3 into the press-fit hole 2, a downward force acts on the entire workpiece, and the press-fit portion 2a on the side where the press-fit is not performed is supported by the press-fit portion support member 6.
is supported in an elastic state.

The movement is stopped by the stopper 15, and the bush 3 is further pushed forward to the press-fit portion 6 placed on the press-fit reference and fitted into the press-fit hole 2. In this manner, the press-fit hole to be press-fitted can be accurately positioned regardless of the pitch with other press-fit holes or the machining accuracy of the press-fit portion.

After the fitting is completed, the air cylinder 8 is operated to lower the operating shaft. This is because if the press-fit shaft 7a is pulled out from the press-fit hole 2 while the air in the cylinder is compressed, the positioning pin 9 will rise due to the elastic force of the compressed air, and the fitted bush 3 will fall out. This is to prevent After lowering the air cylinder 8, the press-fitting cylinder 7 is operated to fit the bush 3 into the press-fitting hole 2, and the press-fitting shaft 7a is raised to complete the press-fitting.

The same operation as above is performed for the other press-fit hole 2, and the bushing is press-fitted into the two press-fit holes 2 using one press-fit device.

In addition, in this example, description was given of press-fitting a bush into a workpiece having two press-fit holes, but three
The present invention can also be applied to workpieces having the above-mentioned press-fit holes, and a workpiece positioning unit, a reference guide unit, and a press-fit unit are arranged for each press-fit hole, and a plurality of workpieces can be formed by arranging a workpiece positioning unit, a reference guide unit, and a press-fit unit for each press-fit hole. It becomes possible to press-fit the bushing into the press-fit hole.

Effects of the invention As explained above, according to this invention, a workpiece positioning unit, a reference guide unit, and a press-fitting unit are arranged corresponding to each press-fitting hole, and only the press-fitting hole to be press-fitted is placed in a floating state. Since the bushing is press-fitted after positioning, even if the pitch accuracy between the press-fit holes and the machining accuracy of the press-fit part are not ensured, the press-fit holes can be positioned accurately and the press-fit can be performed with high precision. This makes it possible to press-fit bushings into multiple press-fit holes in a workpiece using a single press-fitting device. In addition, in the device of this invention, the press-fitting part support member and the press-fitting hole of the workpiece placed thereon are configured to elastically move up and down within a predetermined range, and a tapered positioning pin is inserted into the press-fitting hole. Since the press-fit hole is positioned with
Since the locating pin is pushed back out of the press-fit hole, the bush is guided relative to the press-fit hole by the press-fit shaft and the locating pin.
Therefore, the bushing can be press-fitted accurately and easily.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of this invention, Fig. 2 is a side view, Fig. 3 is an enlarged sectional view of the bush fitted into the press-fit hole, and Fig. 4. is a perspective view of FIG. DESCRIPTION OF SYMBOLS 1... Workpiece, 2... Press-fitting hole, 2a... Press-fitting part, 3... Bush, 4... Base, 6... Press-fitting part support member, 7... Press-fitting cylinder, 8... Air cylinder, 9... ...Positioning pin, 13...Work holding plate, 15...Stopper.

Claims (1)

[Claim for Utility Model Registration] In a bushing press-fitting device for press-fitting a rubber bushing into a press-fitting hole of a workpiece, a workpiece positioning unit, a reference guide unit, and a press-fitting unit are respectively disposed corresponding to each press-fitting hole, and the above-mentioned The workpiece positioning unit includes a press-fit part support member disposed on a base so as to be elastically movable within a predetermined range in the press-fit direction of the bush, and a press-fit part support member whose distal end has a smaller diameter than the inner diameter of the press-fit hole and whose proximal end is connected to the press-fit hole. and a positioning pin having a tapered shape having approximately the same diameter as the inner diameter of the press-fitting part, and a positioning pin inserted into the press-fitting hole placed on the press-fitting part supporting member through the press-fitting part supporting member and further elastically retracted. The reference guide unit includes a workpiece holder that restricts movement of the workpiece beyond a predetermined range in the forward direction of the positioning pin, and a stopper that restricts movement of the press-fitting part support member beyond a predetermined range in the press-fitting direction of the bush, Further, the press-fit unit includes a moving means that holds the bush on a press-fit shaft that is fitted on the same axis as the positioning pin, and moves the press-fit bush toward the press-fit hole by pressing and retracting the positioning pin. A floating positioning type bushing press-fitting device.